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Koichi Hirose (広瀬 康一, Hirose Kōichi) was confirmed to return for All-Star Battle R during the game's initial announcement trailer.[1]
His moveset is fundamentally the same as his from All-Star Battle, with a few tweaks being made to both balance the character and fit him into the overall gameplay tweaks that All-Star Battle R brought.
In the English localization of the game, Koichi's Stand, Echoes, is localized as "Reverb", carried on from its All-Star Battle debut.
Replacing Koichi's previous voice actor, Romi Park, is Yuki Kaji, who has voiced him since the Diamond is Unbreakable anime adaptation. Because of this, and like the majority of the game's roster, voicelines for Koichi were either added or re-recorded.
Koichi has 900 health and uses the Stand (スタンド, Sutando) Battle Style, fighting foes with Echoes. During a fight, he can use various moves from his appearance in Diamond is Unbreakable.
The player's health is decreased. The opponent's health continuously refills.
Secret Missions
1. Down your opponent: 1000 G 2. Land a Stylish Evade: Iggy Publicity Artwork 3. Land the "A 'nasty' habit" skill: Iggy's Theme 4. Win with a Great Heat Attack: Iggy Special Outfit A
Entrance Dialogue
Koichi: That's a Stand! Are you telling me a dog can be a Stand user?! Iggy: I'm on walkies, so get lost or I'll rip your leg off!
Victory Dialogue
Iggy: I can tell you're a dog lover, so I went easy on you.
Defeat Dialogue
Koichi: Wow, that was quite a shock! Maybe Police will develop a Stand next?
Koichi's theme is Does This Mean I've Gotten Stronger?! (ひょっとして成長したんですかァ！？, Hyottoshite Seichōshitan desu ka!?), and can be unlocked in-game by winning with a Dramatic Finish in All-Star Battle Mode's Koichi vs Yukako Yamagishi Normal Battle.
Koichi's Theme
Its name is in reference to Koichi saying the line "Does that mean I got stronger again?" in Chapter 93 of Diamond is Unbreakable in response to Echoes ACT 2 evolving into Echoes ACT 3.
An ally from Part 4: Diamond is Unbreakable. He is the user of the StandEchoes, and one of Josuke Higashikata's classmates. Timid and unreliable at first, he slowly earns the trust of his friends, and even some enemy Stand users form a one-sided friendship with him. Although initially annoyed at Yukako Yamagishi's love for him, he eventually reciprocates her feelings.
User of the Stand Reverb and one of Josuke Higashikata 4's classmates. Weak and unreliable at first, he slowly earns the trust of his friends, and even some enemy Stand users. Yukako Yamagishi's affections for him are eventually reciprocated.
Koichi Hirose's Stand. At first, it appears in the form of an egg, but while fighting Tamami Kobayashi, it breaks its shell to be born.[3] Echoes evolves with Koichi, initially taking an insectoid form and gradually becoming more human. ACT1 and ACT2's skills are sound-based, while ACT3 has the ability to make matter heavier. The different ACTs can be utilized depending on the situation.
Koichi Hirose's Stand, first revealing itself fighting Tamami. Reverb evolves with Koichi, initially taking an insectoid form and gradually becoming more human. Acts 1 and 2's skills are sound-based, while Act 3 makes the opponent heavier.
The cliffside where Koichi and Yukako fought. It became infamous due to an urban legend about a young woman who was bounced gently along the rocks with a "boyoyoing" while attempting suicide. Located in the northeastern part of Morioh.
The cliffside where Koichi and Yukako fought. It's famous for the urban legend about a young woman who jumped to her death, only to be bounced gently along the rocks below with a boing. Located in the northeastern part of Morioh Town.
Taunt Lines
1500 G
Echoes Act 1 Reference Sketch
Buffs
Nerfs
Neutral
Normal Costume
Iggy's Theme
Iggy Special Outfit A
Koichi Color Tint C
and 
versions)
